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Patterns
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Two Pointers
Two Pointers
Master these 22 problems to understand the Two Pointers pattern.
Start Here
125. Valid Palindrome
Easy
88. Merge Sorted Array
Easy
26. Remove Duplicates from Sorted Array
Easy
283. Move Zeroes
Easy
977. Squares of a Sorted Array
Easy
344. Reverse String
Easy
Core Interview Set
🔒 167. Two Sum II – Input Array Is Sorted
Locked
🔒 15. 3Sum
Locked
🔒 11. Container With Most Water
Locked
🔒 75. Sort Colors
Locked
680. Valid Palindrome II
Easy
Sliding / Two-Pointer Crossover
🔒 3. Longest Substring Without Repeating Characters
Locked
🔒 567. Permutation in String
Locked
🔒 209. Minimum Size Subarray Sum
Locked
🔒 424. Longest Repeating Character Replacement
Locked
🔒 992. Subarrays with K Different Integers
Locked
Advanced Must-Do
🔒 42. Trapping Rain Water
Locked
🔒 18. 4Sum
Locked
🔒 881. Boats to Save People
Locked
🔒 763. Partition Labels
Locked
🔒 838. Push Dominoes
Locked
844. Backspace String Compare
Easy